#define _CRT_SECURE_NO_WARNINGS 1
#include<iostream>
#include<cstring>
using namespace std;
const int N = 110, M = 10010;
int n, m;
int a[M];
int f[N][N];
int main()
{
    cin >> n >> m;
    for (int i = 1; i <= m; i++)
    {
        cin >> a[i];
    }
    for (int i = 1; i <= n; i++)
    {
        for (int j = 1; j <= n; j++)
        {
            cin >> f[i][j];
        }
    }
    for (int k = 1; k <= n; k++)
    {
        for (int i = 1; i <= n; i++)
        {
            for (int j = 1; j <= n; j++)
            {
                f[i][j] = min(f[i][j], f[i][k] + f[k][j]);
            }
        }
    }
    int ret = 0;
    for (int i = 1; i < m; i++)
    {
        ret += f[a[i]][a[i + 1]];
    }
    cout << ret << endl;
    return 0;
}